@thumperguy
I agree and learned this when I participated in a, I think it was, twice weekly for 9 or 10 weeks pulmonary rehab program and learned pursed lip breathing for my MAC and bronchiectasis. I regularly hike and carry a pulseoximeter with me to verify a 90 or above reading and if below, I stop until it’s back to 92-93. We live and hike at 3000 feet or slightly higher. If we go to an altitude higher than 6500’, I must hike with an oxygen generator by Inogen. I now need oxygen when I sleep unless I’m at below 2000’. Air travel means bringing along the Inogen, too. BTW for those who have had the misfortune of somehow picking up pseudomonas aeruginosa, I went full bore with the twice a day for 28 days nebulizing with 7% saline followed by tobramycin. It was a difficult regimen and I did develop a slight tinnitus but that has diminished. According to a recent specimen analysis, I seem to have gotten rid of it.